"Done Signing" button issue on pdf forms.

I've been using this feature everytime I fill out a form. But now, it's grayed out. Done uninstalling and reinstalling Adobe Reader. But still the same.

What's weird is, I checked the security properties of the pdf form using Adobe Acrobat to check if I accidentally set a restriction on that file, but I did not. No restriction being set on my pdf form. Try to check the screenshot.

Please help me guys.